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3 years ago

I need help with this math

Mathematics

2 answers:

Crank3 years ago

7 0

Answer:

1. is 8/15 2. is -4.7 3. is 15.68 4. is -7/24 5. is -9/4 6. is 6.9 7. is 3/5 and hold on I'll get 8 9 and 10 for you

alisha [4.7K]3 years ago

7 0

Answer:

1. 8/15 H

2. -4.2 U

3. 15.68 I

4. -7/24 R

5. -5 1/2 E

6. 6.9 T

7. 3/5 Q

8. 5 2/3 0

9. -25.38 A

10. -2 1/2 S

It has square roots

Step-by-step explanation:

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Ill mark you brainliest please help !

Artemon [7]

Answer: (-2, 1)

Step-by-step explanation:

3 0

3 years ago

The area of a right triangle is sixty square centimetres. Its base is one centimetre less than twice its height. If the base and

NemiM [27]

Answer:

5. None of the above

Step-by-step explanation:

We have this information:

A = 60 cm2

b = 2*h - 1

Let's find out b and h:

The equation of the are of a triangle is A = (b*h)/2, if we replace it with our information, we have

$60 = ((2*h - 1) * h)/2\\ 120 = 2*h^2 - h\\ 0 = 2*h^2 - h - 120$

Let's find h with the quadratic formula:

$\fbox {Quadratic formula:} \frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$h = \frac{-(-1)\pm\sqrt{(-1)^2-4*2*(-120)}}{2*2} = \frac{1\pm\sqrt{961}}{4} = \frac{1\pm\ 31}{4}$

h = 8 or h = -7.5

But h represents the height of the triangle, so it has to be a positive number, that's h = 8.

If we replace this in the equation we had for b, we have that b = 2*8 - 1 = 15.

Now we can calculate the hypotenuse with the Pythagorean equation

$\fbox {Pythagorean equation:}$ <em>The square of the length of the hypotenuse (the side opposite the right angle) of a right triangle is equal to the sum of the squares of the two legs (the two sides that meet at a right angle). </em>

The base and the height are our legs. We will use "H" for the hypotenuse

$H^2 = b^2 + h^2 = 15^2 + 8^2 = 289\\ H = \sqrt {289} = 17$

H = 17

If we decrease the base and the height by 2 centimeters, we have

b' = 15 - 2 = 13 and h' = 8 - 2 = 6

With this, let's calculate the new hypotenuse:

$H'^2 = b'^2 + h'^2 = 13^2 + 6^2 = 205\\ H' = \sqrt {205} \approx 14.3$

$H' \approx 14.3$

So, the hypotenuse decreases $H - H' \approx 17 - 14.3 = 2.7$

3 0

3 years ago

Two lines that do not intersect are always parallel

kolezko [41]

Step-by-step explanation:

lines which do not intersect are always parallel and the answer will be parallel lines only...

6 0

3 years ago

Peyton is going to invest $71,000 and leave it in an account for 18 years. Assuming the interest is compounded continuously, wha

rewona [7]

Answer:

2.23

Step-by-step explanation:

4 0

3 years ago

For the inequality, decide whether the solution is represented by x <2.5 OR x >2.5. -25 > -5(x+2.5)

omeli [17]

To solve the inequality -25 > -5(x + 2.5), first multiply -5 by the number and variable in the parentheses.

-25 > -5x - 12.5

Now add 12.5 to both sides of the equation.

-25 + 12.5 > -5x - 12.5 + 12.5

-12.5 > -5x

Now divide -12.5 by -5 to get the answer.

-12.5 ÷ -5 is 2.5

You would think the final answer is 2.5 > x, but that is not true because -5 is negative and when a negative number is divided to both sides of an inequality, the sign gets flipped.

So, the real answer is 2.5 < x, or x > 2.5.

3 0

3 years ago